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Commissioning checks
Once the above setup procedure has been
carried out, the unit is available to operate
according to the requirements of the control
signal and set parameters.
During initial operation, the following should be
checked:-
• the water and steam installation for any
leakage.
• the humidifier for any signs of damage.
• the humidifier and steam pipe fixings for
security.
• the electrical installation for any signs of
damage.
• the display panel for caution or critical alarm
indication.
Commissioning - hand over
Upon full and satisfactory completion of
commissioning, a record of commissioning
information should be left with the person
responsible for the humidifier.
The commissioning engineer must ensure that
the user is familiar with the safe and efficient
use of the unit, detailing the function of all
controls and main components.
The user should be made aware of the following
in particular: -
• Start up, shutdown and operational
information.
• Safety features, data plate, and labelling.
• The requirement for regular inspection -
especially if the humidifier is within a more
demanding environment - and the need for
regular servicing carried out by a suitably
qualified person.
Operation
With the I/O/II switch in the "I" (Run) position,
whenever steam is required the electrodes are
supplied with voltage via the main contactor.
Simultaneously, the water inlet valve opens and
water enters the steam cylinder.
Vapac, Virtuoso VE Humidifier, Installation Manual, EN 2024-01, D301474 Iss 0
As soon as the electrodes come into contact
with the water, current begins to flow between
the electrodes, generating heat and increasing
the water evaporation rate, in turn producing
steam.
As more of the electrode surface area is exposed
to conductive water, the higher the current
consumption becomes and thus the greater the
steam production.
Upon reaching the required steam capacity, the
water inlet valve closes.
If the steam generation decreases below a
certain percentage of the required capacity,
due to the lowering of the water level (e.g.
because of the evaporation process or drainage),
the water inlet valve opens until the required
capacity is available again.
If the required steam capacity is lower than
the actual output, the water inlet valve is
closed until the desired capacity is achieved by
the lowering of the water level (evaporation
process).
A cylinder full electrode sensor, provided in
the steam cylinder, detects when the cylinder
water level is at the maximum. When the sensor
comes in contact with water, the water inlet
valve will close after a short delay.
As a result of the evaporation and refill process,
the conductivity of the water increases due to
an escalating mineral concentration. Eventually,
an inadmissibly high current consumption
would take place if this concentration process
were permitted to continue. To prevent this
concentration from reaching a value unsuitably
high for the operation, a quantity of water
is periodically drained from the cylinder and
replaced by fresh water.
When starting with an empty cylinder, the
Vapac controller switches in the contactor and
feeds water until the water level reaches the
electrodes and current starts to flow.
Thereafter, the system will continuously
monitor and control the cylinder conductivity by
adjusting the amount of water drained from and
fed into the cylinder in the manner described
earlier.
C
Page No 39 of 80
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